Internal Filters

Internal Filters

The internal power filter is probably the most widely used type of filter and they are available in a wide range of sizes from micro filters, suitable for very small tanks of 18" (45cm) or less, up to large units capable of filtering tanks of 100 gallons (500 litres) or more. The typical internal power filter is a plastic box with slits in the bottom and sides, filled with a sponge media and attached to the pump unit. They are normally attached to the aquarium wall using rubber suckers. When the pump is switched on, tank water is drawn through the sponge media where it is filtered and then pumped back into the aquarium. When placing a filter in the aquarium it is a good idea to situate the filter in such a way that the outlet of the filter is close to or above the water surface. Oxygen exchange only occurs at this level, so ensuring there is always movement increases oxygen levels in the water. Some internal filters come with a space inside the filter chamber where activated carbon can be placed to add an additional level of filtration.

Fluval U2 Underwater Filter

The U2 Filter includes practical and versatile features, making it ideal for application in fresh, marine and reptile environments.

The filter provides the option of setting the flow output in 3 different positions, a key benchmark in underwater filtration. The adjustable 3-way flow control feature lets you position the water flow output to meet your specific needs. The Top Output setting provides maximum circulation and oxygenation, the Integrated Spray Bar setting provides a gentle, even flow for planted aquariums, and the Bottom Output setting is for deep water agitation.

The filter also has a convenient flip-top lid that allows quick and easy access to the filter cartridge for maintenance or replacement. The filter can be installed vertically against the aquarium wall to create currents or customized flow patterns; it can be placed horizontally in shallow water tanks; or it can be used to create decorative features such as waterfalls.

Fluval U3 Underwater Filter

The U3 Filter includes practical and versatile features, making it ideal for application in fresh, marine and reptile environments.

The filter provides the option of setting the flow output in 3 different positions, a key benchmark in underwater filtration. The adjustable 3-way flow control feature lets you position the water flow output to meet your specific needs. The Top Output setting provides maximum circulation and oxygenation, the Integrated Spray Bar setting provides a gentle, even flow for planted aquariums, and the Bottom Output setting is for deep water agitation.

The filter also has a convenient flip-top lid that allows quick and easy access to the filter cartridge for maintenance or replacement. The filter can be installed vertically against the aquarium wall to create currents or customized flow patterns; it can be placed horizontally in shallow water tanks; or it can be used to create decorative features such as waterfalls.

Fluval U4 Underwater Filter

The U4 Filter includes practical and versatile features, making it ideal for application in fresh, marine and reptile environments.

The filter provides the option of setting the flow output in 3 different positions, a key benchmark in underwater filtration. The adjustable 3-way flow control feature lets you position the water flow output to meet your specific needs. The Top Output setting provides maximum circulation and oxygenation, the Integrated Spray Bar setting provides a gentle, even flow for planted aquariums, and the Bottom Output setting is for deep water agitation.

The filter also has a convenient flip-top lid that allows quick and easy access to the filter cartridge for maintenance or replacement. The filter can be installed vertically against the aquarium wall to create currents or customized flow patterns; it can be placed horizontally in shallow water tanks; or it can be used to create decorative features such as waterfalls.